[PATCH v2 6/6] staging:iio:ad2s90: Check channel type at read_raw

From: Matheus Tavares
Date: Fri Oct 26 2018 - 22:00:57 EST


This patch adds a channel type check at the beginning of the
ad2s90_read_raw function. Since ad2s90 has only one channel, it just
checks if the given channel is the expected one and if not, return
-EINVAL.

Signed-off-by: Matheus Tavares <matheus.bernardino@xxxxxx>
---
drivers/staging/iio/resolver/ad2s90.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/staging/iio/resolver/ad2s90.c b/drivers/staging/iio/resolver/ad2s90.c
index 52b656875ed1..24002042a5c5 100644
--- a/drivers/staging/iio/resolver/ad2s90.c
+++ b/drivers/staging/iio/resolver/ad2s90.c
@@ -34,6 +34,9 @@ static int ad2s90_read_raw(struct iio_dev *indio_dev,
int ret;
struct ad2s90_state *st = iio_priv(indio_dev);

+ if (chan->type != IIO_ANGL)
+ return -EINVAL;
+
switch (m) {
case IIO_CHAN_INFO_SCALE:
/* 2 * Pi / (2^12 - 1) ~= 0.001534355 */
--
2.18.0